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Access parent DataContem>x m>t from DataTemplate
I have a ListBom>x m> which binds to a child collection on a ViewModel. The listbom>x m> items are styled in a datatemplate based on a property on the parent ViewModel:
...
How to find out what type of a Mat object is with Mat::type() in OpenCV
... you can call it like so:
string ty = type2str( M.type() );
printf("Matrim>x m>: %s %dm>x m>%d \n", ty.c_str(), M.cols, M.rows );
Will output data such as:
Matrim>x m>: 8UC3 640m>x m>480
Matrim>x m>: 64FC1 3m>x m>2
Its worth noting that there are also Matrim>x m> methods Mat::depth() and Mat::channels(). This function is jus...
How to check if variable's type matches Type stored in a variable
...ns.
The is operator does not check if the runtime type of the operand is em>x m>actly the given type; rather, it checks to see if the runtime type is compatible with the given type:
class Animal {}
class Tiger : Animal {}
...
object m>x m> = new Tiger();
bool b1 = m>x m> is Tiger; // true
bool b2 = m>x m> is Animal; ...
The most efficient way to implement an integer based power function pow(int, int)
...
Em>x m>ponentiation by squaring.
int ipow(int base, int em>x m>p)
{
int result = 1;
for (;;)
{
if (em>x m>p & 1)
result *= base;
em>x m>p >>= 1;
if (!em>x m>p)
break;
base ...
Using {} in a case statement. Why?
...tter how many lines are there in a case statement, all of the lines are em>x m>ecuted. Is this just a rule regarding older/newer compilers or there is something behind that?
...
Python how to write to a binary file?
...
This is em>x m>actly what bytearray is for:
newFileByteArray = bytearray(newFileBytes)
newFile.write(newFileByteArray)
If you're using Python 3.m>x m>, you can use bytes instead (and probably ought to, as it signals your intention better). B...
Why should hash functions use a prime number modulus?
...ought a data structures book off the bargain table for $1.25. In it, the em>x m>planation for a hashing function said that it should ultimately mod by a prime number because of "the nature of math".
...
What is this weird colon-member (“ : ”) syntam>x m> in the constructor?
Recently I've seen an em>x m>ample like the following:
12 Answers
12
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YYYY-MM-DD format date in shell script
...le to use printf's built-in date formatter (part of bash) rather than the em>x m>ternal date (usually GNU date).
As such:
# put current date as yyyy-mm-dd in $date
# -1 -> em>x m>plicit current date, bash >=4.3 defaults to current time if not provided
# -2 -> start time for shell
printf -v date '%(...
Measuring the distance between two coordinates in PHP
...
Not long ago I wrote an em>x m>ample of the haversine formula, and published it on my website:
/**
* Calculates the great-circle distance between two points, with
* the Haversine formula.
* @param float $latitudeFrom Latitude of start point in [deg de...